U.S. intelligence agencies were aware months ago that Army Major Nidal Hasan was attempting to make contact with people associated with al Qaeda, two American officials briefed on classified material in the case told ABC News.
It is not known whether the intelligence agencies informed the Army that one of its officers was seeking to connect with suspected al Qaeda figures, the officials said.
One senior lawmaker said the CIA had, so far, refused to brief the intelligence committees on what, if any, knowledge they had about Hasan's efforts.
CIA director Leon Panetta and the Director of National Intelligence, Dennis Blair, have been asked by Congress "to preserve" all documents and intelligence files that relate to Hasan, according to the lawmaker.
On Sunday, Senator Joseph Lieberman (D-CT) called for an investigation into whether the Army missed signs as to whether Hasan was an Islamic extremist.
"If Hasan was showing signs, saying to people that he had become an Islamist extremist, the U.S. Army has to have a zero tolerance," Lieberman told Fox News Sunday.
Investigators want to know if Hasan maintained contact with a radical mosque leader from Virginia, Anwar al Awlaki, who now lives in Yemen and runs a web site that promotes jihad around the world against the U.S.
In a blog posting early Monday titled "Nidal Hassan Did the Right Thing," Awlaki calls Hassan a "hero" and a "man of conscience who could not bear living the contradiction of being a Muslim and serving in an army that is fighting against his own people."
According to his site, Awlaki served as an imam in Denver, San Diego and Falls Church, Virginia.
The Associated Press reported Sunday that Major Hasan attended the Falls Church mosque when Awlaki was there.
The Telegraph of London reported that Awlaki had made contact with two of the 9/11 hijackers when he was in San Diego.
He denied any knowledge of the hijacking plot and was never charged with any crime. After an intensive investigation by the FBI, Awlaki moved to Yemen.
People who knew or worked with Hasan say he seemed to have gradually become more radical in his disapproval of the war in Iraq and Afghanistan.
A fellow Army doctor who studied with Hasan, Val Finell, told ABC News, "We would frequently say he was a Muslim first and an American second. And that came out in just about everything he did at the University.
Finell said he and other Army doctors complained to superiors about Hasan's statements.
"And we questioned how somebody could take an oath of office…be an officer in the military and swear allegiance to the constitution and to defend America against all enemies, foreign and domestic and have that type of conflict," Finell told ABC News.
The Army Chief of Staff, General George Casey, raised concerns over the weekend that innocent Muslim soldiers could suffer as a result of the shooting at Fort Hood.
"I think the speculation (on Hasan's Islamic roots) could potentially heighten backlash against some of our Muslim soldiers," he said on ABC's "This Week."
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